/*
* Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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*/
package java.awt.desktop;
import java.awt.Desktop;
import java.awt.GraphicsEnvironment;
import java.awt.HeadlessException;
/**
* Event sent when the user session has been changed. Some systems may provide a
* reason of a user session change.
*
* @see UserSessionListener#userSessionActivated(UserSessionEvent)
* @see UserSessionListener#userSessionDeactivated(UserSessionEvent)
* @since 9
*/
public final class UserSessionEvent extends AppEvent {
/**
* Use serialVersionUID from JDK 9 for interoperability.
*/
private static final long serialVersionUID = 6747138462796569055L;
/**
* The reason of the user session change.
*/
private final Reason reason;
/**
* Kinds of available reasons of user session change.
*/
public static enum Reason {
/**
* The system does not provide a reason for a session change.
*/
UNSPECIFIED,
/**
* The session was connected/disconnected to the console terminal.
*/
CONSOLE,
/**
* The session was connected/disconnected to the remote terminal.
*/
REMOTE,
/**
* The session has been locked/unlocked.
*/
LOCK
}
/**
* Constructs a {@code UserSessionEvent}.
*
* @param reason the reason of the user session change
* @throws HeadlessException if {@link GraphicsEnvironment#isHeadless()}
* returns {@code true}
* @throws UnsupportedOperationException if Desktop API is not supported on
* the current platform
* @see Desktop#isDesktopSupported()
* @see java.awt.GraphicsEnvironment#isHeadless
*/
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